From e53f0f51a62061e0c654d4b2f82d4c71b4d71932 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Sat, 28 Apr 2007 16:09:22 +0000
Subject: [PATCH] [BZ #4102]

2007-04-28  Ulrich Drepper  <drepper@redhat.com>
	[BZ #4102]
	* sysdeps/posix/getaddrinfo.c (default_labels): Assign separate
	label to Teredo tunnel addresses 2001://32.
---
 ChangeLog                   |  6 +++
 sysdeps/posix/getaddrinfo.c | 82 ++++++++++++++++++++++++++++++++++---
 2 files changed, 83 insertions(+), 5 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 4f27af326b..2d3e7b6dfa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2007-04-28  Ulrich Drepper  <drepper@redhat.com>
+
+	[BZ #4102]
+	* sysdeps/posix/getaddrinfo.c (default_labels): Assign separate
+	label to Teredo tunnel addresses 2001://32.
+
 2007-04-27  Ulrich Drepper  <drepper@redhat.com>
 
 	* locale/programs/ld-collate.c (collate_read): Allow order_start
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index 298755f8e7..adb3c4f96a 100644
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -61,6 +61,10 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <nscd/nscd-client.h>
 #include <nscd/nscd_proto.h>
 
+#ifdef HAVE_NETLINK_ROUTE
+# include <kernel-features.h>
+#endif
+
 #ifdef HAVE_LIBIDN
 extern int __idna_to_ascii_lz (const char *input, char **output, int flags);
 extern int __idna_to_unicode_lzlz (const char *input, char **output,
@@ -1094,6 +1098,10 @@ static const struct prefixentry default_labels[] =
 	= { .u6_addr8 = { 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } },
       7, 6 },
+    { { .in6_u
+	= { .u6_addr8 = { 0x20, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } },
+      32, 7 },
     { { .in6_u
 	= { .u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } } },
@@ -1728,6 +1736,16 @@ gaiconf_reload (void)
 }
 
 
+#if HAVE_NETLINK_ROUTE
+# if __ASSUME_NETLINK_SUPPORT == 0
+/* Defined in ifaddrs.c.  */
+extern int __no_netlink_support attribute_hidden;
+# else
+#  define __no_netlink_support 0
+# endif
+#endif
+
+
 int
 getaddrinfo (const char *name, const char *service,
 	     const struct addrinfo *hints, struct addrinfo **pai)
@@ -1763,20 +1781,74 @@ getaddrinfo (const char *name, const char *service,
     return EAI_BADFLAGS;
 
   struct in6addrinfo *in6ai = NULL;
-  size_t in6ailen;
+  size_t in6ailen = 0;
   bool seen_ipv4 = false;
   bool seen_ipv6 = false;
+#ifdef HAVE_NETLINK_ROUTE
+  int sockfd = -1;
+  pid_t nl_pid;
+#endif
   /* We might need information about what kind of interfaces are available.
      But even if AI_ADDRCONFIG is not used, if the user requested IPv6
      addresses we have to know whether an address is deprecated or
      temporary.  */
   if ((hints->ai_flags & AI_ADDRCONFIG) || hints->ai_family == PF_UNSPEC
       || hints->ai_family == PF_INET6)
-    /* Determine whether we have IPv4 or IPv6 interfaces or both.  We
-       cannot cache the results since new interfaces could be added at
-       any time.  */
-    __check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen);
+    {
+      /* Determine whether we have IPv4 or IPv6 interfaces or both.  We
+	 cannot cache the results since new interfaces could be added at
+	 any time.  */
+      __check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen);
+#ifdef HAVE_NETLINK_ROUTE
+      if (! __no_netlink_support)
+	{
+	  sockfd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
 
+	  struct sockaddr_nl nladdr;
+	  memset (&nladdr, '\0', sizeof (nladdr));
+	  nladdr.nl_family = AF_NETLINK;
+
+	  socklen_t addr_len = sizeof (nladdr);
+
+	  if (sockfd >= 0
+	      && __bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0
+	      && __getsockname (sockfd, (struct sockaddr *) &nladdr,
+				&addr_len) == 0
+	      && make_request (sockfd, nladdr.nl_pid, &seen_ipv4, &seen_ipv6,
+			       in6ai, in6ailen) == 0)
+	    {
+	      /* It worked.  */
+	      nl_pid = nladdr.nl_pid;
+	      goto got_netlink_socket;
+	    }
+
+	  if (sockfd >= 0)
+	    close_not_cancel_no_status (sockfd);
+
+#if __ASSUME_NETLINK_SUPPORT == 0
+	  /* Remember that there is no netlink support.  */
+	  if (errno != EMFILE && errno != ENFILE)
+	    __no_netlink_support = 1;
+#else
+	  else
+	    {
+	      if (errno != EMFILE && errno != ENFILE)
+		sockfd = -2;
+
+	      /* We cannot determine what interfaces are available.  Be
+		 pessimistic.  */
+	      seen_ipv4 = true;
+	      seen_ipv6 = true;
+	      return;
+	    }
+#endif
+	}
+#endif
+    }
+
+#ifdef HAVE_NETLINK_ROUTE
+ got_netlink_socket:
+#endif
   if (hints->ai_flags & AI_ADDRCONFIG)
     {
       /* Now make a decision on what we return, if anything.  */